<template>
  <canvas></canvas>
</template>

<script>
export default {
  name: "index",
  methods:{
    show(){
      "use strict";

      // Initial Setup
      var canvas = document.querySelector("canvas");
      var c = canvas.getContext("2d");

      canvas.width = innerWidth;
      canvas.height = innerHeight;

      // Variables
      var mouse = {
        x: innerWidth / 2,
        y: innerHeight / 2 - 80,
      };

      var colors = ["#00bdff", "#4d39ce", "#088eff"];

      // Event Listeners
      addEventListener("mousemove", function (event) {
        mouse.x = event.clientX;
        mouse.y = event.clientY;
      });

      addEventListener("resize", function () {
        canvas.width = innerWidth;
        canvas.height = innerHeight;

        init();
      });

      // Utility Functions
      function randomIntFromRange(min, max) {
        return Math.floor(Math.random() * (max - min + 1) + min);
      }

      function randomColor(colors) {
        return colors[Math.floor(Math.random() * colors.length)];
      }

      // Objects
      function Particle(x, y, radius, color) {
        var _this = this;

        var distance = randomIntFromRange(50, 120);
        this.x = x;
        this.y = y;
        this.radius = radius;
        this.color = color;
        this.radians = Math.random() * Math.PI * 2;
        this.velocity = 0.05;
        this.distanceFromCenter = {
          x: distance,
          y: distance,
        };
        this.prevDistanceFromCenter = {
          x: distance,
          y: distance,
        };
        this.lastMouse = { x: x, y: y };

        this.update = function () {
          var lastPoint = { x: _this.x, y: _this.y };
          // Move points over time
          _this.radians += _this.velocity;

          // Drag effect
          _this.lastMouse.x += (mouse.x - _this.lastMouse.x) * 0.05;
          _this.lastMouse.y += (mouse.y - _this.lastMouse.y) * 0.05;

          // Circular Motion
          _this.distanceFromCenter.x =
              _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;
          _this.distanceFromCenter.y =
              _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;

          _this.x =
              _this.lastMouse.x +
              Math.cos(_this.radians) * _this.distanceFromCenter.x;
          _this.y =
              _this.lastMouse.y +
              Math.sin(_this.radians) * _this.distanceFromCenter.y;

          _this.draw(lastPoint);
        };

        this.draw = function (lastPoint) {
          c.beginPath();
          c.strokeStyle = _this.color;
          c.lineWidth = _this.radius;
          c.moveTo(lastPoint.x, lastPoint.y);
          c.lineTo(_this.x, _this.y);
          c.stroke();
          c.closePath();
        };
      }

      // Implementation
      var particles = undefined;
      function init() {
        particles = [];

        for (var i = 0; i < 50; i++) {
          var radius = Math.random() * 2 + 1;
          particles.push(
              new Particle(
                  canvas.width / 2,
                  canvas.height / 2,
                  radius,
                  randomColor(colors)
              )
          );
        }
      }

      // Animation Loop
      function animate() {
        requestAnimationFrame(animate);
        c.fillStyle = "rgba(255, 255, 255, 0.05)";
        c.fillRect(0, 0, canvas.width, canvas.height);

        particles.forEach(function (particle) {
          particle.update();
        });
      }

      init();
      animate();
    }
  },
  mounted() {
    this.show()
  }
}
</script>

<style scoped>
body {
  overflow: hidden;
  margin: 0;
}

.twitter:hover a {
  transform: rotate(-45deg) scale(1.05);
}
.twitter:hover i {
  color: #21c2ff;
}
.twitter a {
  bottom: -40px;
  right: -75px;
  transform: rotate(-45deg);
}
.twitter i {
  bottom: 7px;
  right: 7px;
  color: #00aced;
}

.social-icon a {
  position: absolute;
  background: white;
  color: white;
  box-shadow: -1px -1px 20px 0px rgba(0, 0, 0, 0.3);
  display: inline-block;
  width: 150px;
  height: 80px;
  transform-origin: 50% 50%;
  transition: 0.15s ease-out;
}
.social-icon i {
  position: absolute;
  pointer-events: none;
  z-index: 1000;
  transition: 0.15s ease-out;
}

.youtube:hover a {
  transform: rotate(45deg) scale(1.05);
}
.youtube:hover i {
  color: #ec4c44;
}
.youtube a {
  bottom: -40px;
  left: -75px;
  transform: rotate(45deg);
}
.youtube i {
  bottom: 7px;
  left: 7px;
  color: #e62117;
}

</style>
